In an unfortunate turn of events this week, Apple appears to have stopped signing iOS 12.1.1 beta 3 for most or all iOS devices. Before last night, this was the last jailbreakable firmware that could still be downgraded to via iTunes since Apple closed the signing window for the official iOS 12.1.1-12.1.2 releases exactly one month ago.
Hacker an unc0ver lead developer Pwn20wnd confirmed the unsigning status via Twitter in the wee hours of the night, shortly following up with reports saying that it was still being signed by Apple for certain devices. As expected, a couple of high-profile individuals such as rootlessJB 3.0 developer Jake James and OsirisJailbreak12 creator GeoSn0w confirmed that the firmware wasn’t being signed for their devices: